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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b57c6daaa68844dc28221de63ca1e19a59480f552139ec0c1cca8e755352012' 
  AND token = 'aOHeS9bkeECGfHp8gLIbG0RgW3weS8zXQaEcIVf649s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}